By D. A. Harbour, T. J. Hill W. A. Blyth (1981), , 31–40.

Page 2, Results, second paragraph.

The second paragraph should be replaced by the following:

The severity of erythema was scored 0 to +++. A score of + was recorded when the skin of the right ear was clearly more pink than that of the left. A +++ score implied that the right ear was bright red. The proportion of surviving animals with a score of at least ++ varied from only 23% in the Bristol Swiss mice to 97% in NIH mice infected with 6 × 10 p.f.u.

The incidence of ear paralysis varied between 10% in MFI mice and 73% in SWR mice. There was no correlation between severity of erythema and presence of ear paralysis.


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